a man builder is installing precast concrete wall structure with steel bar on top floor of building, warning orange safety helmet

aerial apartment architecture armbeam blue builder building business city civil concrete condominium construction consultant crane development engineer engineering equipment estate floor foundation glove helmet high house industrial industry landscape machine machinery materail modern move net new precast prefab project property protection real residential safety scaffolding site sky skyscraper slab steel story structure tall technology top tower town urban vest view wire work worker working